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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73f0a2a32bce68a613505e5ac7892e27853422f4552e55835c5cb0e09eff301' 
  AND token = 'NnFNPLk/S9A3LVhi7W6Z1hp7l9ubcaOzZAEuS2N6LUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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