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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689282cb20b1a2dc4228376c69ac023e674e31cd41dc148226e1bf777e606c91' 
  AND token = 'GX73XrxKGhwy8eJlc3I2LiwXn3F8SoID14mys9jH5sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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