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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ea25d263add0f98031e054364b9e1ea2251d0e08ab550fe4a28e824e4cc9d6' 
  AND token = 'm7hgAWpiWkVdCoMhFcf3tbU9hRX9VvuRqFBXLNrROKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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