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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274f99025994a4a58b2894115c2a6ea4c81e4daa1da89bbb431892db575b7540' 
  AND token = 'oGIDb/B+Q7CgyPCY6RN9bFeLeh902cIKTm/DB05btl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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