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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69cd2c36858d5f863463723ed5d24beb4bd328c3e726b5bfb2c4f6b5a5995d9' 
  AND token = 'JuJlUgST/2FkKkF8lHD4BWbwrKNET82glpZBGuqcW7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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