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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd306eddf02338015eab8c5b96d1ba2a06df069cad9de29a586b27fac6861d9' 
  AND token = 'vgh4e2QrtactroXMaeVGCI2Pe2jZPfF936GyB8gem54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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