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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd906b0ce1042af5094ff1502cf1ae89abd8ddcff30ff671fbeac638c07fdda' 
  AND token = 'zvulTtqQZz+G/4M+GyiqNkKISDlO4Yj6vkMxpBtfi8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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