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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7a2a62f7c34a7df23f421acc9866446a4e3d8d4cb580cd093c24ed976c0597' 
  AND token = '2kyIDlwiPRk1wqBoHDj5hj+ljMsjvpT8sfmtM0hLBvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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