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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f739358f7ee68fa3e195008b93ccc0ad829c39fd7b19d8a25652bbcfdbac9616' 
  AND token = 't6vS+ICv7/5v2HrFPWkt0sbryx8eD7CWwOFlntozl2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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