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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352a7f73593ded8ff1cce7b81beee5e47c38f9395fff1e7dac58c6f33423994c' 
  AND token = 'n8SYtc0fwgbyUVq3qBDnziTRx1n+2T/Eq+wR9HaL2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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