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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12141973ece2ccef1afdc41dfa90dc9cb4f6e333756e2dbde82235e7d7c904ad' 
  AND token = '91yDyw6x/IdYV6ddmMDJDVrU/wuLHelXVwRcyG4S6vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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