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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b82547f24a0e4e394751d134be87ee633f15ba63f532f51d36b80c42181d60' 
  AND token = 'C40ufrk6PlK4Gb4Gm7Qrrm2UJLoa8EmyeDmIUo1So2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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