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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2084882dc33339d548dac1ff7ba07ba2a8a0a6cf4def51237a3ed3f1471902' 
  AND token = 'kwulI6wd8M/GIvclYaQyOLKeoJ6QrebNtZ1xO37/Wmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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