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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbb8fba8acadffd8a617c9ba49410e47e0aac1d2bc03b7f317982a78c99f3f6' 
  AND token = 'rIyQeYUxlFW/P6HRGUx4dv2vHg/TOkHrLmAmnJHbCbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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