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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807880834e5a14e9efb61ee166c47cd26aca17bcd2f5b6edaadfddb7461f478d' 
  AND token = 'JK5rvf/6VMFkYu2qFddoBh8eJIzREKsHcRsrhjMkL6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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