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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4135dd24da1d789cedf2d2c50a6cd325303391eefdb4de1e27bef7274d73bb65' 
  AND token = 'tQOfyaQKFQcQCwFiUs9piH4Z1hqLOAY4rkK78yIxgwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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