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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f7b76db56d86680be7af66068bff2ea7ffd9eeab033916b11a0fa86214c7b3' 
  AND token = 'k2S0I+SGsqzSadz65cvvC6P0jD1VzMky2HU2PVJwvWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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