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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b438794c3017d9ec9c0d21c59afcd181ca96cbd62c2109a427d1d001cac728be' 
  AND token = 'l8V8OkEjASOodzCs4w7D1qlUdRZ2ZByoHkuwnIvK4II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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