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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6140c03b66d4be90d9663da85d68a8d9ec2fb0012fecb3444b61cb7223dc68e2' 
  AND token = 'ruUugOvtB3Ii1ZeB6YLiJvrb+4x3cgxk9mnjXvcYG80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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