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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd699e46067da50c2117b9f19300897fcae8e5a11c702542cca7e51e3808a8299' 
  AND token = 'Bot+83FXaGXiNgeh0NuwWmSttxUROt3z1uYb7MXLrOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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