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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed085ea3d3c25138365650c51961a0d05b1352f5d9665845f1b270b831b8ff7f' 
  AND token = '6T8QL5A7bv9oLFESxhDvO6StQqibR+qs1xYj+XH7yU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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