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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856efb48d3537df80802cd2cbcd200be5c92ad8f032c12c79804a54bd5c9d7b1' 
  AND token = 'KZTb/S25+FkKGxCIBWb5g/mfedbNiPJVSIE83l0V3no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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