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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9fb0e77f74305dc3be0af4a14ab8ddeb0132627a402a69fb0c623f02b7ca3a' 
  AND token = 'ufzSQa9YptGyKnqvoOFBb4vc0qC7TVJ24vT4b91ATsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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