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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d7664041b68ee2d44523e008e3b41c43a3d38df8612fdb7d1238263b082938' 
  AND token = '0nsCOny8/x+6ujJ5a3jf5OpMu2OVT1K7deqtSxbvVpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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