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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdba94e98204f9519ee7dec49d4767f91f482914d3393a12b5b29bc98b47098' 
  AND token = 'JGPMvDMUcPBjddXDjJldFaCGR5tF52EC6Mp94e3pWJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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