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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9266950365577da9207d26623d67e6e81d2e372f944bf6d9bc52a30d8ef3af82' 
  AND token = 'qa9jwW8jpelltXd4j/6NQ5Vkc4lnVNtRQ6nVfHuxe3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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