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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6109a3f6d74f04783c22b1654c4e2dcfeb60e6d472b9b53f09a5d086660d93a' 
  AND token = '2ymKx+FpA96paagVPhWfuBdPUZOwLOe1n0UBTSjKD4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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