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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82194f238cadee65073502f3b2ccf8b130c6497226bd619333cde6cb69eca6cf' 
  AND token = 'IRC8c1MehvnHnFdgVoeLQ5aNBRNJNnnheXfw1FLfH88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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