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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770169d2eca264d98740d64f8444db3063810bcb36e3d95b3f03192451663c3e' 
  AND token = 'OH9mk7ejXheoMwbiUEPbe5TEp9ICAmJtK2T0KXY90qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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