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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccdfe5595e2eac51d5b157821d4f0ddc96840b6e0c0acee820c1cf8f1f8d2ae' 
  AND token = 'vJ4Le7HNu+xwD1FqB0E+ymjl5l/r8D+tke78Wd62hqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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