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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421beb6f15634ce01099db7ceb2f6b8dfbcc29ef412daccd78581851a5f03bbe' 
  AND token = 'hoEtQH4TTd55KCFhL4k0u3twMnXR2YZ44kY1HXhOIa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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