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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02809d353a705133c2fd2c790f42723a639b95176345fff8f87203419f7ef8be' 
  AND token = '4m1tA6jQMG2CFxXnft1epXz3AxHbTqd05+5PQ2zyTBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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