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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6b67e4e6dea1eeb8aa5599dd09573290edfdcb03d21ece7cdd8be1e03f8f64' 
  AND token = 'suQHW5bBe1uZIxUnkZcEyxh97Q2wK5+Ommjttfj3208=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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