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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de57e2d363d682957cb35957879804e4112f8fe1de7699c86de4f8d2b5d5937' 
  AND token = 'bRW+b9KugRnByElzt8qLrjX+Ns/kFpL4SNKflTZyunk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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