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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17237157244611f8376ef042ea4543f4efae4540c29ece386ce9f4dcae7a0db' 
  AND token = 'idvpI8LJpvOvc8ic7nvE1KshxC6q+qx6NZbS23JPsk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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