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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10c67b32376d08adce045552bf9c67f8d96ba8fe3fd373787e905204310c014' 
  AND token = '757Vd7I7p4Kq3fQnjFo6OcQuQHa0SlGZ6wxim4P+k3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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