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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67527fb7bb27c4804c568ad329da81634463f1045d877049734d21b02a6e3b0b' 
  AND token = 'v1Y9AIy4lZBAW7Wx5TxjadNZ0Kvgcd6MhKM07eDsahc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}