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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a623f331ba561d635c40b5ee2f4e1a8f2095591238c8febd426b36b5ce7bdfe0' 
  AND token = 'YrIBTjxblaTqOrnXZMzcQzlzIUZLd7/hLs8hkF0N/po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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