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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfc0aeb8bf4a19ef2a802d9afc8ce1d3253a9f39bbdf1818a2260ccfa1911d0' 
  AND token = 'y2+8Ji3UJfAAX/ISRs3QsgpwKQfc1AEvQXXX9bfZ/Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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