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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7268618c0d0d3cda3e47827cf699ac1d7b4bfdb288325f612efc10a79f4570d1' 
  AND token = 'cUorip9lsgsdSJlKWWhmvOC5Tcg8aHjF/CrTBWlotCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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