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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acaeebb2c5b2752866432ed94c179aa31d6417bfad31e842c061464ef2aa711' 
  AND token = '8yqoypzRZ1nbchEGD5Md/p4K2fzvdxKALXIRczh4Grc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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