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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c65b2a118dcc65c9dfc9f4bc3f4af164315f7e50a80372dc3a18b3674e11a0' 
  AND token = 'ftsCweK3lduy4mej8nI9iq07AdMbceHIiu5SfFynmEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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