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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b295dfad6a7e48c1f06314cedfcdce52348a8c7c0b58fa334261312e70b23c' 
  AND token = '1q+YZFQiNhM6lObvAR+90GAlTJJxNynIPS3Lfgyr4qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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