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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e55cfa76d6622e7c340e50ba69bef6d70582f3065c33a09f935283bacef9cba' 
  AND token = 'B12wGW1gic8M3GybQKRJaFd+UJJkRGDKIzWiYJG9Gdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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