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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfff8ae1c1466e03dc18645b29e6945224616fc70dda276a0f53b2c4ff7ade61' 
  AND token = 'njurSmzalGYSZkWCNDGzBMkIsYvt6gF9INcNmE0dTPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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