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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83b5d8ae4c13b2f155e30ec6e9fd0f92dab5a8238076ab42028a4625107606d' 
  AND token = '02RD8YPRa0MZ3D071efR8lYzFU2c1PKjupOchEB+mRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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