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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e3fd8d37543e3f5386b0a375fe445361905cb2debb5b331046cb7d7d65fc3f' 
  AND token = 'fb5zjC23gFxTRLG7gDQ6/jmnukx83IbvtMJxzto9u2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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