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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dab230e6a8143d06dfb7f4b20d7e69945c2e14498c6faa75fe31049c7f8b20' 
  AND token = 'CKAqCuDfEN1dnYdOgaXNgv5eBsEXM9k87N8Z9EJCI20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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