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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7285d8e1edad2a2ca131580d5011f50c34120ef0d4f91ebbcf2d8c5697afa42' 
  AND token = 'LwQGB2Op68lbMfvQDWzq59ApIIgIACrkW2rJ/tHLC18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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