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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a59c8e499d2f31bfc4be8aacfdf18645aa7d34dd6b34233a9054b923d4a013' 
  AND token = 'LP8vE32rCaFjJdI8HJIUapdgm61Ch1AYqK5GY2YjN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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