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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edce78077bde67ec32155447b13cd3537b6e5ac3bd0ce5b12168436742be37d8' 
  AND token = 'ZChfzryB0ci3JtnEfgEXGyyiY21Tp9c8ApdiOJC/F0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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