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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa8baaf136b64849cfc403f0fc84e2efb56ace3c24d05e9a98b756ed5cf2661' 
  AND token = '0k0oNPMHxzFJ7zIRhYQSEAdHNxB/Hkso0lWQpEiKn6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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