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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6328770e81228de2986089dd95ffc2289eae8c0a9ec670bd1a008c8c5335952f' 
  AND token = '1Zc4F6ZUnA0ArtdT7k71N4CnuA6eAJjVraWgdSeuL0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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