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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91e9b57459ad977c26eea0858d7c92b130b8045a0c7fd2e16affce20b619cbd' 
  AND token = 'qsiWhlMvR183vNv9tzq3fdFBD5JrwJwEyG3Z7uv/E74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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