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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec868420a058bf52feefc391e17280fecb9ae25b7fcd659ae643ba6b5f0b3405' 
  AND token = 'aygdtz+p3OZ5s0GWN7vePYHAwwvkpe9Oewa00gDy+jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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