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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf623d782ed6cb86729580bd94d5bfb6cba8ecb20acbe0d1ef7949501f2e0e6' 
  AND token = '9LCwGR3P01mwdst4KofJEods4nl81edkLq+QeVhfze4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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