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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8af467521f6df20cb4b0fb0ba3a8f410a86cfbc985bbaf3b07581f8fe113adb' 
  AND token = 'nbNLZgXaD1DgVP/OhaPCvEIZPLsZMU4z9eaGvDq8tPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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