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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea3f4e5a2d863de4d734bf5d3b7ae8444c86222ff0cdad50df0593efb2811b0' 
  AND token = 'gmV9lKJzWa6mW472lDHxBL3z0Vk1uIxdmq6u/SApBOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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