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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e804d7641a143efd78935ae6ce9f86e8b0ac3ab6c722e49e55f2cc7877b020c' 
  AND token = 'L+7OvSLTso3rCBHwpaa3cadjFyB/18s9qsgL0DIP/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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